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WO3/W Nanopores Sensor for Chemical Oxygen Demand (COD) Determination under Visible Light

机译：WO3 / W纳米孔传感器用于可见光下的化学需氧量（COD）测定

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摘要

A sensor of a WO3 nanopores electrode combined with a thin layer reactor was proposed to develop a Chemical Oxygen Demand (COD) determination method and solve the problem that the COD values are inaccurately determined by the standard method. The visible spectrum, e.g., 420 nm, could be used as light source in the sensor we developed, which represents a breakthrough by limiting of UV light source in the photoelectrocatalysis process. The operation conditions were optimized in this work, and the results showed that taking NaNO3 solution at the concentration of 2.5 mol·L−1 as electrolyte under the light intensity of 214 μW·cm−2 and applied bias of 2.5 V, the proposed method is accurate and well reproducible, even in a wide range of pH values. Furthermore, the COD values obtained by the WO3 sensor were fitted well with the theoretical COD value in the range of 3–60 mg·L−1 with a limit value of 1 mg·L−1, which reveals that the proposed sensor may be a practical device for monitoring and controlling surface water quality as well as slightly polluted water.
机译：提出了一种结合薄层反应器的WO3纳米孔电极传感器，以开发化学需氧量（COD）测定方法，并解决了标准方法测定COD值不准确的问题。可见光谱（例如420 nm）可用作我们开发的传感器中的光源，这是通过限制光电催化过程中UV光源的突破。优化了工作条件，结果表明，在214μW·cm −2的光强度下，以浓度为2.5mol·L -1 的NaNO3溶液为电解质并在2.5 V的施加偏压下，即使在很宽的pH值范围内，该方法也准确，重现性好。此外，由WO3传感器获得的COD值与理论COD值在3–60 mg·L -1 的范围内非常吻合，极限值为1 mg·L - 1 ，这表明所提出的传感器可能是一种用于监测和控制地表水以及轻度污染水的实用设备。

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